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United States Patent | 5,519,759 |
Heineck ,   et al. | May 21, 1996 |
The base stations (BS) in a multicellular, wireless telephone system are connected via trunk lines (VL) to a communication system (KS), particularly to a telephone private branch exchange. The base stations (BS) are arranged at such a distance from one another that synchronization information (si) wirelessly transmitted from one base station (BS) can be at least partially received in a neighboring base station (BS). Both the initial, wireless synchronization as well as the synchronization during operation are controlled by the communication system such that respectively one base station (BS) is synchronized to the synchronization information (si) transmitted from a neighboring base station (BS). Compared to a synchronization of the base stations (BS) via trunk lines (VL), these deviations due to running times and different processing speeds in the synchronization unit realized in circuit-oriented terms are avoided in the wireless synchronization. Furthermore, synchronization of base stations (BS) across communication systems is possible.
Inventors: | Heineck; Frank (Munich, DE); Klug; Karl (Miesbach, DE) |
Assignee: | Siemens Aktiengesellschaft (Munich, DE) |
Appl. No.: | 250482 |
Filed: | May 27, 1994 |
May 28, 1993[DE] | 43 17 895.2 |
Current U.S. Class: | 455/422.1; 455/502 |
Intern'l Class: | H04Q 007/36 |
Field of Search: | 379/59 455/33.1,51.1 375/356 |
5404575 | Apr., 1995 | Lehto | 455/51. |
Foreign Patent Documents | |||
0226610 | Jan., 1987 | EP. | |
0437835 | Jul., 1991 | EP. | |
3011935 | Oct., 1981 | DE. |
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